Script for copy datetime from original MOV/MP4 file to compressed.

copytime.sh

#!/bin/bash

# Get all files with uppercase MP4 and MOV
files='*.MP4 *.MOV';
# Go through files
for f in $files;
do
  # Create a regexp for find compressed file
  regexp=$(echo $f | sed -e "s/\(.*\)\(\.\)\(...\)/\1\*.\L\3/"| tr -d '\n');
  # Find compressed file
  compressed=$(echo $regexp);
  # If file exists
  if [ -f "$compressed" ]
  then
    echo "File $f is updated"
    # Modify with original date & time
    touch -r $f $compressed
    # Remove original file and rename compressed
    mv $compressed $f
  fi
done